Use LSB functions for communication in init script

When restarting or reloading the daemon in logrotate or cron, the use of 'echo' will cause email messages to be sent to system admins. By sticking to the LSB log_daemon_msg it will work as intended.

We're not using RedHat-based systems, so I can't tell if there is a similar change to be made in templates/gunicorn.rhel.init.erb.